Performance optimizations for sqlite3VXPrintf().

FossilOrigin-Name: 9227ad48e1612b32a3a3e9551c49890f93abc0a7
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 8bf05a9..1f10c31 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -3222,6 +3222,7 @@
 
 void sqlite3StrAccumInit(StrAccum*, char*, int, int);
 void sqlite3StrAccumAppend(StrAccum*,const char*,int);
+void sqlite3StrAccumAppendAll(StrAccum*,const char*);
 void sqlite3AppendSpace(StrAccum*,int);
 char *sqlite3StrAccumFinish(StrAccum*);
 void sqlite3StrAccumReset(StrAccum*);